252
Table 10.1 Quick-reference guide for satisfying the requirements of a “good” PROM for use in
individual patients with OA (as opposed to groups where some requirements are lower)
PROM Subscale Content
validity
internal
consistency
Test-retest
reliability^
Construct
validity
Floor effects
(≥15% score
lowest score)#
Ceiling effects
(≥15% score
highest score)#
Missing
items
Knee OA
WOMAC Pain / / 19-41% (post-
TKR)
1-3%
Stiffness / 15-19% 19% (pre-TKR);
16-67% (post-
TKR)
Function / / 45% (post-TKR)
KOOS Pain / 15-22% (post-
TKR)
0-5%
Symptoms /
ADL /
Sport/rec 16-73% 16-20% (post-
HTO; post-TKR)
QoL 15% (post-
HTO)
17% (post-TKR)
KOOS-PS 0%
Oxford Knee
Score
27% (post-TKR) 0-5%
ICOAP (knee
version)
Constant / 33% (knee OA) 0%
Intermittent
Total / /
Hip OA
WOMAC Pain / 34-38% post-
THR
?
Stiffness 28-31% post-
THR
?
Function 11%^
HOOS Pain / 19-47% (post-
THR)
0.08-
3.6%
Symptoms / 29.1% (post-
THR)
ADL /
Sport/rec / 17.8% (pre-
THR)
QoL /
HOOS-PS? 0%
(continued)
N.J. Collins and E.M. Roos